Yes there is, could you please expand on what it is you are trying to achive? That would be helpful to provide an answer that is relevant to your requirement? EG a URL for what? Are there multiple URL's for varying systems? What are you using those URL's for? In WFA terms you can could create your own datasource and dictionaries to store this information if you have multiple URL's for varying systems or if it's a just a single URL that requires variable input into your workflow (EG a URL for a cluster based on the name or IP address) you can set workflow constant and concatenate the URL using a variable value.
Can you share more details on what you'd like to achieve?
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